package com.edu;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.gateway.filter.ratelimit.KeyResolver;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.Objects;

/**
 * 微服务网关
 *
 * @author YJF
 */
@SpringBootApplication
@EnableEurekaClient
public class GatewayApplication {

    public static void main(String[] args) {
        SpringApplication.run(GatewayApplication.class, args);
    }

    /**
     * 创建用户唯一标识，使用IP作为用户唯一标识，来根据IP进行限流操作
     *
     * @author YJF
     */
    @Bean(name = "ipKeyResolver")
    public KeyResolver userKeyResolver() {
        return new KeyResolver() {
            @Override
            public Mono<String> resolve(ServerWebExchange exchange) {
                String ip = Objects.requireNonNull(exchange.getRequest().getRemoteAddress()).getHostString();
                return Mono.just(ip);
            }
        };
    }
}
